Finding the Fourth Proportional to 1,431.72, 1,975.59 and 842.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.72 : 1,975.59 = 842.04 : x
2. Step 2: Convert to fraction form
   1,431.72/1,975.59 = 842.04/x
3. Step 3: Cross multiply
   1,431.72x = 1,975.59 × 842.04
4. Step 4: Simplify right side
   1,431.72x = 1,663,525.80
5. Step 5: Solve for x
   x = 1,663,525.80/1,431.72
6. Step 6: Final answer
   x = 1,161.91